Air-heating furnace



(No Model.) 4 Sheets-Sheet 1.

J. R. BARKER. AIR HEATING FURNACE No. 402,795. Patented May 7, 1889.

N4 PETERS, Phnlo-Lnmgra fiar, Wnshinglan. D.(l

(No Model. 4 SheetsSheet 3. J. R. BARKER. AIR HEATING FURNACE.

Patented May 7, 1889.

(No Model.) 4 SheetsfSheet 4.

J. R. BARKER. AIR HEATING FURNACE.

No. 402,795. Patented May 7, 1889 N PETERS. Phoio-Llllwgnpher. WihKnglum Dv C- UNITED STATES ATENT OFFICE.

JOHN R. BARKER, OF CHICAGO, ILLINOIS.

AIR-HEATING FURNACE.

SPECIFICATION forming part of Letters Patent No. 402,795, dated May 7,1889.

Application filed November 27, 1888. Serial No. 292,039- (No model-l Toall whom it 12mg concern:

- the furnace for which Letters Patent of the United States were grantedto me on May 28, 1872, being No. 127,140, and on September 22, 1885,being No. 326,541; and it has for its object to provide certainimprovements thereto; and my invention consists of the novel devices andcombinations of devices hereinafter described and specifically claimed.

In the accompanying drawings, Figure 1 represents a longitudinalvertical section, and Fig. 2 a transverse vertical section, through thecenter of the furnace. Fig. 3 is a sec tional plan on line 3 3 in Fig.1, and Fig. 4 is a sectional plan 011 line 4 4 in Fig. 1. Fig. 5represents an elevation of the furnace, the outer shells or casing beingremoved, and Fig. 6 shows a plan of the water-receptacle detached.

Corresponding letters of reference in the several figures of thedrawings designate like parts.

A denotes the base of the furnace, also providing the bottom for theash-pit B, having door a. The ash-pit casting B supports the fire-pot C,and below this fire-pot the grate D, having shaker-arm b, is pivotedupon a dump-frame, 0, having trunnions to its rear that rest in U-shapedbrackets d, forming part of the ash-pit casting,while itsforwardlyprojecting arm is supported by a swinging bolt, 6, that can beswung to clear such arm and allow the grate to be lowered for removingthe clinkers in the ordinary well-known manner. Upon the upper groovededge of the fire-pot C is placed a ring-chamber, R, made in halvesbolted together and provided with an air-inlet opening, f, an d with aseries of internal vents, g, that will admit atmospheric air to enter insmall jets and mix with the gases generated from the fuel to make themcombustible, and thereby utilize the same and economize fuel. Upon thisring-chamber R is fitted the somewhat conical combustionchamber composedof sections E, F, and G, the sections E and F also providing thefuel-feed channel h with fuel-door 2', and the section F having cast aseries of elbow-shaped gas-outlet extensions, j, communicating withnozzles K, forming part of section F. The uppermost section, G, iscylindrical, and is closed on top by a concaved circular plate, Z.

An upper ring-shaped chamber, H, has a series of downwardly-projectingnozzles, m, connecting with the nozzles is of combustionchamber sectionE for supporting chamber H and for providing a series of communicatingflues between the combustion-chamber and ring-shaped chamber H, andbetween this chamber H and another ring-shaped chamber, I, placed tosurround the fire-pot C, is provided communication. through a series ofpipes, J, one for each two fiues, K m. The ring I. has a thimble, a,projected through the casing and provided with a nozzle for connectingsmoke-pipe K, and also provided at its end with a door, 0, arranged tobe adjustably opened for admitting air to check the draft of thefurnace, if desirable. This smokepipe K is also connected with athimble, 19, forming part of ring-chamber H to afford communicationtherewith and to let the gases escape direct from such upperring-chamber, H, whenever it is desirable to produce a strong draft, andthis thimble p is provided with a damper, q, which with closing willcause the gases to circulate through the lower ringchamber, I. The upperring-chamber, H, is also pierced by a series of vertical flues, r, forair to be heated to rise through the same.

Upon standard lugs s forming part of ribs tof base A is placed thehorseshoe-shaped water-receptacle M, having a pipe tapped into one side,which pipe extends through the easing, where a spout-casting, Q, isconnected thereto provided with a cover for feeding water into suchreceptacle, which water will evaporate into the air passing through thefurnace to be heated therein for impregnating such air with the requiredmoisture to make it heathful.

This furnace is incased with galvanized sheet-metal shell N, made incylindrical sec tions connected by cast-metal rings r and closed 011 topby a crown-sheet, 10, which is to be provided with openings for thehot-air-eonducting pipe, to be connected therewith in the usual manner,and inside of shell N another cylindrical shell, 1?, is supported onhooks m, secured to one of the rings 1*, for retaining the heat in thefurnace and for preventing the outer shell from becoming heated.

-\Vhat I claim is- 1. In an air-heating furnace, the combination, withfire-pot C and colnbustion-chamber composed of the parts E and F, theformer being provided with elbow-pipes j and nozzles 71:, extendingupward, of the ring-chamber placed on a higher level than thecombustionchamher and having downwardly-extending nozzles in, connectingwith nozzles 71' to form communicating fines, and the ring-chamber I,surrounding the fire-pot, and the pipes J, connecting the chambers 11and I, as set forth.

In an air-heating furnace, the combination with fire-pot C andcolnbustioil-chamber E F, the former being provided with elbowpipes andnozzles k, of ring-chamber 11,10- cated above the combustion-eha1nbersand pierced with air-circulating tubes r, and provided with nozzles m,to connect with nozzles 70, and of ring-chamber I, surrounding thefirepot and communicating with ring-chamber II through pipes J, allsubstantially as set forth.

The combination with an ash-pit, a firebox, eombustion-chamber, andring-chambers surrounding said firebox and combustionchamber, of ahorseshoe-shaped water-receptacle placed below the ring-chan1bers andpartially snrroun ding the ash-pit, and a spoutcasting, Q, on theoutside of the furnaceshell, and a pipe connecting the trough M and saidcasting, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN R. BARKER. \Vitnesses:

\VILLIAM II. Lo'rz, OTTO LUBKERT.

